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參數(shù)資料
| 型號： | R3131N40BA-TR-FB |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | SOT-23, 3 PIN |
| 文件頁數(shù)： | 10/31頁 |
| 文件大?。?/td> | 247K |
| 代理商： | R3131N40BA-TR-FB |
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R3130NxxxA/C, R3131NxxxA/C
18
OPERATION
Operation of R3130N Series
VDD
OUT
Pch
Ra
Rb
Nch
GND
Comparator
Vref
-
+
Delay
Circuit
Block Diagram
Minimum Operating
Voltage(VDDL)
Tdelay
GND
B
A
1
2
3
4
5
Supply
Voltage
(VDD)
Output
Voltage
(OUT)
Detector Threshold(VDET)
=Released Voltage
Operating Diagram
In the above diagram,
x Output voltage becomes equal to supply voltage (Nch open drain output Type; equal to pull-up
Voltage).
y
When supply voltage is down to the detector threshold level (Point A), Vref
≥ VDD× Rb/(Ra+Rb) is
true. Then, Output of the comparator is reversed, thus output voltage becomes equal to GND level.
z
When supply voltage is lower than minimum operating voltage, output of transistor is indefinite,
therefore output is also indefinite.
{
Output voltage is equal to GND level.
|
When supply voltage is higher than released voltage (Point B), Vref
≤ VDD× Rb/(Ra+Rb) is true. Then
output of the comparator is reversed, thus output voltage becomes equal to supply voltage (Nch
open drain output type; equal to pull-up voltage).
* There is no hysteresis range between detector threshold and released voltage.
CMOS output type
OUT pin is connected to the
drain of Nch Tr. and Pch Tr. in this
IC.
Nch open drain output type
OUT pin is connected to the
drain of Nch Tr. in this IC. (OUT pin
should be pulled up to VDD or an
external voltage level.)
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| R3131N40BC | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Low Voltage Detector with built-in Delay Circuit |
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| R3131N40DA | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Low Voltage Detector with built-in Delay Circuit |
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